Automatic weighing apparatus.



S. H. JOHNSON.

AUTOMATIC WEIGHING APPARATUS.

APPLICATION FILED NOV. 13. m3.

1,135,379. I Patented Apr. 13, 1915.

m- T 1 H H YE U 1 I A L, J v. I A am F ii a H 4 111;; "iiiiii Lj 720mm I m c1115 army S.

THE NORRIS PETERS (2).. PHOTO-LING}. umsmmmn. D. C.

" l Lj feasfa 7 To all whom/it may Emma- '20) mm avnm'r seatn'comranr; or gnon rn Mmwnuxnm wrseonsm "connected with automatic?weighing appai i'atus, 1 -theiobje ct Qfthfi invention i's-to prevent the escape of dust by trapping it,"

between the: outlet'of the supply hopper land the, inlet of the weigh-i hopperi-c"Various means have previously 'been-vusedafor accomplishing success.

a" object with varying My invention consistsin providing: an fex; tensionto the snppl'yhcpperswhich' is 'fastened thereto, formingaftrapping: or inclos-j p ing receptacle: or chamber between the "sup-V 7 ply and weigh hoppers; The-"shaman sion' is formed; with a {sleeve or iun'nel ft pass throughthe'inletiand into the weighl hopper, approximatinggclosclyto the forma; tion of the said inlet, but allowing a-lslight 1" 'clearan ce between thecsleeve or funnel and theinlet of the weigh hoppe 'r to permit of accurate weighing. The'f'extfension is also pro/vi ded with flange'f against a which the I 'wveighhopper bears when empty-or of less l f weight than; the counterbalancingmeans, j thus" forming a joint:between the weigh] hopperand dust receptacle-or chamber dur- V 'ing such time as granulargor the likematerial is being supplied. The fiange may' be prm'ided with a packing. strip ofsuitable V be provided for the purpose of'equalizingY nation with automaticyweigh'ing apparatus,

that it is' desirable tOI extend the axis lor' spindle of the supply gate or valve through H the said extensionv and attach any operat- 7 'ing mechanism or linkage exterior toJthe' said cover tolpreve'nt "the entrappeddust,

material, as example, asbestos, india rubber,

or thelike, to minimize shock and improve therjoint. Whenrequired a ventpipe. may

atmospheric pressure, and as an outlet for some of the dust trapped within therecep- 3 n l operating mechanism orlinkage is attached thereto exterior'to the casing Bto prevent the entrapped dustcloggingthe mechanism Y tacle or chamber. 7 p p I It is found in practice when utilizing this improved type ofdustfcover or trapin combielogging the mechanism and. checking the free, operation thereof. v When the material 1 v amb mclwmmaem nut s l Specification:ofijlietters '1. Ami neuron fiidenove be' is; ei

1 said iinletfbutsthey.id I

Lnot to'interfere with the accuracy ofw'eig aweighihopper abuts when receiving its sup; ply of material (see the dotted lineyposition of 'theweighhopper :Fig. 1). p This flangegF' maybe provided witha packing or blifler strip of asbestos, india rubber, or the like i pfl to minimizeishock'. vent or 'outletisqpro' vided in the-side of the :extension, and is poses.

; L te ented pi ziie riai wioz soo, 7eaf f, i i

so'nononnnni; Bmmmam-mj at p; amson f is :appro'achingijitlie v piointr ofbalance, the; weigh thopper; moves out? of contact withfthejsaiid receptacle: or w chamber,-, thusfallowing freef movement ,of' l the" weigh v beam and its attachments, and V insuringan equaliaccu racyiin weighment as v isobtainable without a "dust trap/"I 1 1 n-The accompanying}?drawings xillu trate v the"construction;ofgmyginventiomin which? i :Fignre liis apart side elevation: and Fig, f2 isga;partpend elevation; I

.; The supply hopper outlet is l ed; byan extension B forming an outerica'sw for fthell'owerf part :ot theqsuipply'hop .per and; completely I embracing a the outlet thereof, thexextension B'is providied with ga sleeve .C' which gisa'rranged-ito. enter it-lie 'in let 1:

[of the weighl hop'pensDir FThe sIeeve; ap-

proximates closely shape and size to? *the p Y or not. contact; in 0rd ing; Between theyextension andfthe sleeve is 'fl-ange E against Which the :inlet' of the covered by a slidingplateEiiiThevent ora --outletmay be l sed to.eQHaIiZwatmOSPhericG n 'i '7 pressure, orforinspectionfor cleaning pup;

Itwillbe as that hen the weigh-hop pier-D is in elevated position, and in engage ment with thefla'nge E,ino}dust can escape,

and when the "weigh-hopper) moves down- I weigh-hopper thereby preventing thejesc'ape of dust. Y :,The spindle or Partial Vacuum s Q' fl th fein causing1the' entrainment of; air, fi tor a axiseG of'the supply gate V H is-extended through'thecasing and'an'y" and checkingtheifree operation of the scale. \Vhen' the-mat'erial in the weigh hopper ,D

is approachingthe point"of balance, the, weigh hopper moves cfrom contact with'the I flange E. of the extension or casing B-(see ,ing free movement, of thecuwe'igh beam and .itsattachments', and insuring as eqi ztlaccuthe-1111 line position inFig. 1,) thusallowc p y iIl igllrnent as can be obtained scales not employing a, dusttrap.

WVhat I claim is; 7' '1. In a weighing apparatus, the combination with thesupply gate and weigh hopper, of a casing surrounding the supply gate, said casing, in the elevated'position of the weigh'i hopper, extending below the mouth of the; weigh-hopper a distance greater than: the movement of the gweighhopper,sa id extended portion of the casing conforming substantially'to the contour of the mouth of the weigh-hopper and located in proximity thereto, and an abutment adapted to close the mouth of the weighhopper when the latter is in elevated position.' i

a 2'. In a weighing-apparatus, the combina- P tion with the supply gatepandrweigh hopho'pper, saidextended portion of the casing conforming substantially-to the contour of themouth of the weigh-hopper and located in :proximity thereto, and an abutment "adapted to close the mouth of the weighhopper when the latter is in elevated po a sition.

Copies of -this patent may be obtained for 'fiveeents eaeh, by addressing the Gomin'issioner of Patents,

' Washington, D; 0. I r a in presence of I Inaweighing apparatus, thecombination with the supply gate and weigh hop- 1-,;o a casing surrounding the supply gate, said casing', inftheelevated position of the "weigh. hopper, extending below the mouth" of the weigh-hopper'ra distance. greater than 'the movement of the Weighhopper, said extended portion of the casing conforming substantially to the'contour of the mouth of theweigh-hopper and located in proximity thereto, and a flange on the casing forming an. abutment adapted to close the'mouth of the 'weigh'hopper when r '45 thelatter is in elevated position.

, 41111 a weighingapp'aratus, the combina- -tion with the supplygate and-weigh'hopper, of aeasing surrounding the supply gate and'extending beyond the mouth ofqthe weigh hopper, and with respect to which the "weigh hopp er is freely movable, and means foreclosing the opening between the casing andthe sides ofthe weigh hopper while the .materialis-being supplied, said oasing'provided with. a 'vent and closure the purpose described 7 v In testimony whereof I afiix my signature two witnesses. V

SIDNEY JOHNSON.

therefor, for

Witnesses: a

GEORGE E. VFOLKES, ERNEST HARKER; I 

